Origin of oort cloud comets in the interstellar space

@article{Valtonen1992OriginOO,
  title={Origin of oort cloud comets in the interstellar space},
  author={Mauri Valtonen and Jiaqing Zheng and Seppo Mikkola},
  journal={Celestial Mechanics and Dynamical Astronomy},
  year={1992},
  volume={54},
  pages={37-48}
}
Comets must form a major part of the interstellar medium. The solar system provides a flux of comets into the interstellar space and there is no reason to suspect that many other stars and their surrounding cometary systems would not make a similar contribution. Occasionally interstellar comets must pass through the inner solar system, but Whipple (1975) considers it unlikely that such a comet is among the known cases of apparently hyperbolic comets. Even so the upper limit for the density of… 
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